[Bug 63031] [Intel GM45][i915-kms]: VGA encoder on SDVOB remains blank when i915.ko is loaded while gfx is in text mode.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63031

--- Comment #12 from Egbert Eich <eich at pdx.freedesktop.org> ---
(In reply to comment #11)
> Actually this is wrong, if the encoder is active it should _always_ have a
> crtc. Can you please sprinkle printks and try to figure out why the encoder
> is active, but doesn't seem to have a crtc attached?


I had added such printks already. In the logs I've posted you will find lines
containing "DAC-11->base.crtc <=".
In fact the encoder is not active: intel_sdvo_get_hw_state() returns false.
Thus it doesn't have a crtc:
[    3.703241] [drm:intel_modeset_setup_hw_state], 2: DAC-11->base.crtc <=     
     (null)
Still it has active outputs: intel_sdvo_get_active_outputs() returns 2.
What I seem to have found out now:
When an encoder is disabled (bit 31 of GEN3_SDVOx is 0) then it must not have
active outputs or SDVO_CMD_GET_ATTACHED_DISPLAYS will not return a result (it
will remain in pending state).

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